KB 949260 - An interesting OCS 2007 update has shown up - related to communicating with LCS 2005 and requires client updates

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Friday, April 25. 2008

KB 949260 - An interesting OCS 2007 update has shown up - related to communicating with LCS 2005 and requires client updates

Check out this update - KB 949260 - here.

Normally I’d write this off as a one-off or an isolated issue, but what caught my interest was the fact that it appears as a High-Priority Update to be installed on all your OCS servers in your organization.

And here is the other oddity that doesn’t seem to be documented very well – which basically requires a LOT of client updates, and makes it sound like someone figured out how to spoof OCS/LCS packets:

This update package replaces the OCS2007-KB946763-x86-Server.msp update package KB 946763 - Update package for Communications Server 2007 (Web Components, Admin Tools, Web Conferencing, Audio Video, Mediation, Archiving, and Server): January 31, 2008

Note: The authentication protocol that is used by Communications Server and its clients has been updated to require a signature in all messages. This includes the first message that carries the challenge response. The version number of the protocol that is advertised in the challenge response has increased to version 4. Challenge responses that use version 4 of the protocol must contain a signature. The signature is a digest of the identifying headers in the message that is calculated by using the session key. To make the Conferencing Add-in for Microsoft Office Outlook work correctly, this update for the Conferencing Add-in must be installed.

Additionally, to make sure that all other clients work effectively against this update, the following hotfixes must be installed on the clients:

KB 948738 - Update for the Conferencing Add-in for Outlook: April 11, 2008

KB 946764 - Windows-based Live Meeting 2007 client update package: April 11, 2008

KB 946164 - Update for Communicator 2007: April 2, 2008

in Microsoft, OCS / LCS, Unified Comm at 13:20 | Comments (2)

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I still don't understand why the client components of OCS are all only hotfixes and not updates which means we can't get them through WSUS. But this is brilliant - a a high priority update for the servers, but nothing pushed to clients automatically to take advantage.

Furthermore, the .msp hotfixes behave differently than any other .msp MSFT releases so it's impossible to actually integrate them into the Communicator.msi file. Has anyone tried this successfully? From what we've tried the only solution is to create a custom package and apply the updates via a batch or VB script. The MSP's flat out don't integrate with the MSI's.

#1 Tom Pacyk (Homepage) on 2008-04-28 13:54 (Reply)

The OCS 2007 server update is security related so it makes sense to update the clients as well when the server-client communcations channel is affected. However, this fact is NOT indicated in any of the client fixes you reference.

#2 Desmond Lee (Homepage) on 2008-05-07 08:16 (Reply)

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